A. The census nowadays does indeed ask fewer questions than in years past, to the disappointment of genealogists across the United States.
But as convenient and beloved a record as it is, the census was never intended as a resource for genealogists. Article 1, Section 2 of the Constitution requires a population count every 10 years for the apportionment of seats in the House of Representatives. The count also affects how more than $400 billion per year in federal funding is distributed to state, local and tribal governments.
There are better ways for the government to get the other data it seeks: The long questionnaire has been replaced by the American Community Survey, sent to a small sampling of the population every year, instead of every 10 years.